Safety device for elevators.



E. A. KRENZ.

SAFETY DEVICE FOR ELEVATORS.

APPLICATION FILED MAY 8, 1911.

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F. A: KRENZ.

SAFETY DEVICE POR ELEVATORS.

APPLICATION FLED MAY 8, 1911.

Patented Apr. 23, 1912.

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APPLICATION FILED MAY 8, 1911,'

Patented Almas, 1912.

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Fad/LK a. l: Ve/wfbz UNITED STATES PATENT oEEIoE.

YBANK KRENZ, OF ST. PAUL, MINNESOTA, ASSIGNOR OF 'ONE-HALF T0 JOHN FLANAGAN, OF ST. PAUL, MINNESOTA.

SAFETY DEVICE FOR ELEVATORS.

To all 'whom t may concern Beit known that I, FRANK A. KRENZ, a citizen of the United States, residin at St'. Paul, in the county of Ramsey and tate of Minnesota, have invented new and useful Improvements in Safety Devices .for E levators, of which the following is a speelfication.

My invent-ion relates to improvements 1n safety devices for elevators. Its object is to provide novel and efficient means for stopping the car in case of accidents.

A further object is to provide means adapted to operate the driving mechanism, and safety devices adapted to initiate themovement of said means to stop the car.

A further object is to provide means for quickly and positively stopping a car if an' object becomes clogged between the car and one of the ceilings of the building, or between the car ceiling and one of the floors. Y

A further object is to provide means adapted to stop and lock the driving mechanism in the eventthat said mechanism allows the car to fall or if the car is stopped by an obstruction in its downward travel.

In the drawings, Figure 1 shows a front elevation of an elevator provided with myV improved safety operating device; Fig. 2 is a side elevation of the same; Figs. 3 and 4 are detail views showing two of the operating parts in my device.; Fig. 5 is a` detail sectional view taken on the ,lineI 5-5 of Fig. 1; Fig. (i is a plan view in detail of the governor and its connection with the operating device; Fig. 7 is a sectional view taken on the line 7--7 of Fig. 6; Fig. 8 is a side elevation vin detail of the brake and its connection with the operating device; and Fig. 9 is a plan view ofthe elevator driving mechanism.

Referring to the accompanying drawings, I have used the reference numeral 10 to indicate the car and the numeral 11 to indicate the supporting cable which extends over the pulleys 12 and 13 to the drum 14. The

driving mechanism for rotating the drum 14 to raise and lower the car is arranged as follows: The gear wheel 15 on said drum 14 meshes with the gear wheel 1G, on the pulley shaft 17, and is driven by said gear wheel 16 to wind and unwind the cable 11. The drive pulley 18 is con-nected by a belt 19 to the pulley 2O and by the crossed belt 21 to the pulley 22, said pulleys 20 and 22 being Specication of Letters Patent.

Application filed May 8, 1911. Serial No. 625,715.

Patented Apr. 23, 1.912.

loosely mounted on the shaft 17. The pulley 23 is fixed to the shaft 17 and is adapted to be driven in one direction by the belt 19 .and in the opposite direction by the belt 21.

I have provided 'the following means for throwing the driving mechanism in and out of gear. The operating shaft 24 is rotatably mounted on the base 10*l and supports the gear wheel 25 which meshesI with the gear wheel 26. The gear wheel 25 is connected through the link 27 to the lever 28, said lever being in connection with the belt shifting bars 29, 30 and 31 and adapted to operate the same to throw either the straight belt 19-or the cross belt 21 on and 0H the drive pulley 23.- The gear wheel 26. is provided lwith an arm 26a which is connected by the slotted link 32 with the brake lever 33, said lever being provided with a weight 34, connected with the brake band 35 on the drive pulley 23 and actuated by said wheel 26 to brake saidv pulley and stop the car when the belts 19 and 21 areshifted therefrom. The driving mechanism is thrown out of gear, and the brake band 35 set when the sha-ft 24 is in its normal position, and is thrown in gear to raise or lower the car and release the brake band 35 when the shaft 24 isrotated ninety degrees in either direction from its normal position. The shaft 24 is rotated by hand to the positions for raising or lowering the car.

The following means are provided for returning the shaft to its normal position to stop the car after the movement of the same has been initiated either by hand or by the hereinafter described safety devices. The arm 36 is rigidly mounted on the shaft 24 and is connected by the link 37 to the lever 38. This lever is notched at 39 and 40, said notches being adapted to engage respectively the pins 41 and 42 in the guides 43. The weight 44 is provided at one'end of said lever and a stop 45. is arranged to engage and support the weighted end of said bar when in its normal position,'as shown in heavy lines in Fig. 5 of the drawings. The stops 46 and 47 are designed to engage the lever 36 and limit the movement of the shaft 24. The rotation of the shaft 24 in one direction to a position for throwing the elevator into gear moves the arm 36 to a position Jengaging the stop 46, and" places the points of connection between the shaft 24,

lio

' vater shaft and around the pulley 53 on the the lever 33, the link 37 and arm `36 in substantial aliiiemeiit with each other 'and causes the lever 3S to be fulcrumed on the pin 42 and locked in a position suspending the Weight 44 out lot its normal position. The slight rotation of the shaft 24 by means of any of the safety devices hereinafter den scribed towardits normal position moves the above mentioned points of connection out of line?. thc shaft is returned to its normal position by the action' of the Weight 44;"the driving mechanism is 'thrown out of and the brake band 35 is set. v The r0- tation oit the shaft 24 in the other direction to the movement oi the car moves the arm 3G to 'al position engaging the stop 47 and places the points of connection between the shaft 24, the lever 38, the link 37, and the arm 3G in substantial alinement and causes the bar 38 to be tulcrumed on the pin 4l. and locked in a position suspendingthe Weight 44 from its normal position. A slight rotation of the shaft 24 from this position rmoves the above mentioned points of connection out et line, thus` causing said shaft. to be returned to its normal position bythe actioi'io the weight 44, throwing,"

the driving mechanism out of gear and loch` ing the same.` The trip cable 48 extendsv around thepulley 52 at the top of the eleshait 24 and rotates said Vshaft when thecai is started toV throw the driving mechanism into gear and when the cer is stopped initi.

ates the rotation of the same to throvr said mechanism out of gear.

The safety device designed to be placedl on the ceilings of the building is arranged as follows: The beam 57 is slidablyl mounted the guidesV .33 and is provided at each end with grooved pulley 59. The cable 60 pa over said pulls and is connected at one end l,to one of the` guides and at the other to the trip bar (il. Said bar is pivotally mounted at 62 and is provided with the rollers. (S3 which. are arranged on opposite sides of 'the cable 49, said cable being con,-

'nected at one end to the top of the elevator-- shaft and at the other to the lei/*er 54 on the shaft Guideirollers 'are provided ttor said cable near its bottom and a weight is atta" ed to said cable to keep it'taut. This cable` 49 is of a. length to permit the movement of the lever -54 to either oi' the horizontal positions shown in'Fig. 3. The beam 57 is arranged on the verge of the e1e-`y vater sh .it so that if ain-.object accidentally prf'ijects lit-om the car while ascending, it will strike and lift the beam. The lifting oi this beam operates thc trip bar 6l Which raises the loo-er end of the cable 49 and starts the rotation of the shaft 24 to throw licdriving mechanism vout of gear. This actionl stopssthe car before the protruding object i"e".iclicsr the ceiling.

f The Vcompanion safety device designed to A'be placed on the ceiling of the car is arranged in a manner similar to the one above described and is in operative connection With the cable 50, Which is arranged and equipped in a manner similar to that of the cable 49, and is connected at its lower end to the lever 57h .on the shaft 24. When the beam 57 is struck and raised by an object protruding into the car, the cable 50 is lifted and initiates the rotation of the shaft 24 to stop the car as above described, thus preventing the protruding object from striking the car ceiling.

I haveprovided-.a governor 5l in connection with the driving mechanism adapted to operate the shaft 24 to stop the car, in case said mechanism fails to operate and allows the car to fall. The governor arms 64 are mounted on the shaft- 17 and are provided with the spring 65, the 'guides 66 and the curved 'lugs 67. The bar 68 is slidably, ijuounted on the shaft 17 and 24, one of its ends being provided with the lug 69, the

With the lug 69 and moving the bar 68, causing one of its lugs 7 Oor 71 to engage the lever 72 and; start the rotation of the shaft 24 to stop the car. t

l have provided avstop to throw :the drivwill be rapidly rotated and thrown outward. thus bringing the lugs 67 intoiengagement ing mechanism out of gear iii casethe car is vobstructed from below and held inA its downward passage. rThis stop prevents the unvvindiiig and tangling of the cable 1l `and is arranged asv follows: The arm 73 is fixed to the' shaft 24 'and is arranged to rest iii the position ishown in dot-ted lines in Fig. 4,

when the driving mechanism is in gear to,

lower the car.` The lever 474 iulcium'ed on the base l0, its upper `end being provided with a stud 75, its lower end extendingto a position beneath the arm 73, as shown in .heavy lines ia Fig. 4. The grooved piilleyv 76, slidably mounted oli said stud 75, is in rolling contact with' the cable 11 as it asses to and from said drum, and is yiel ingly held against said cable 11 by the spring 77.

lf the' car is stopped 'While' the driving mechanism is in gear to lower the same, the 1 cable l1 becomes slackened and the spring i 77 moves the lever 74 and raises the arm`73.

The movement starts the rotation of the sha t- 24 and stops the driving mechanism.

Ihave shown my operating device in connection with the common form of holt driving mechanism. I do not limit myself to this construction, however, as 1t is obvious that the same'may be used in connection with other forms of driving mechanism without departing from t-he spirit of my invention.

Having described my invention, what I claim as new and desire to protect by Letters Patent is:

l. In a device of the class described, the combination of driving mechanism, a car adapted to be lifted and lowered by said mechanism, a rotatable controlling shaft, means for operatively connecting said shaft with the driving mechanism, a lever having a dual fulerum, said lever being pivoted ,on one fulcrnm when the ear is ascending and upon the other when the car is descending, means for connecting said leverwitli the controlling shaft, aweight on the end of the lever, and manually operated means for rotating said shaft.

VE2. In a device `ofthe class described, the

combination of driving mechanism, a caradapted to be lifted and lowered by said mechanism, a rotatable controlling shaft, a lever having two fulcrurns, said levr being pivoted on one fulcrnm when the caris ascending and upon the other when the car 11s descending, means 4for connecting the lever 'with the controlling shaft, a weight on the end of the lever adapted to yieldingly hold the same in its normal position engaging said fulcrums, means for operatively connecting said shaft with the driving mechanism, and manually operated means for rotating said shaft to station and lock the lever ont of its normal position and release the same from itslocked position.

3. In a device of the class described, the combination of driving mechanism, a car adapted to be lifted and lowered by said mechanism, a rotatable controlling shaft, a lever in operativeconneetion with ,said shaft and having a dual fulcrum, a weight on the lever, said lever being adapted to normally engage its fnlcrum's and pivot alternately thereon, means in operative connection with said shaft for starting, stopping and throw! ing the driving mechanism vout of gear and a brake in operative connection with said shaft for locking said mechanism when `ont of gear.

4. In a device ofthe class described, the combination of driving mechanism, a car adapted to be lifted and lowered by said mechanism, a cont-rolling shaft, a lever having two fulcrums for alternately pivoting the same, means for connecting the-lever with the controlling shaft, a weight onthe end of the lever adapted toyieldingly hold the salme in itsnormal position engaging said fnlcrums, means for operatively connecting said shaft with the drivingl mechanism, hand-operated means for rotating said shaft to station and lock the lever out of its normal posit-ion and to release the same from its locked position, and means adjacent to the path of the car in operative connection with said shaft and adapted to rotate the same for releasing said lever from its locked position.

5. In a device of the class described, the

lcombination of driving mechanism, a car adapted to he lifted and lowered by said mechanism, a rotatable controlling shaft, a lever having two fulcrums, means for connecting the lever with the controlling shaft,

a weight on the end of the'lever adapted to 'yieldingly hold the same in its normal posiv tion engaging said fulcrum's, means in operative connection with said. shaft for controlling said .driving mechanism, hand-operated means for rotating said shaft .to station and lock the lever outof its normal position upon either fnlcrum and to release the same from its locked position, and means in the car-in operative connection wit-h said shaft to rotate the same and release said lever from its locked position. i

6. In a device of the class described, the

combination of driving mechanism, a car adapted to be lifted and lowered by said mechanism, a controlling shaft, a lever having two fulcrums upon either of which it may be pivoted, means for connecting the lever With the controlling shaft, a weight on the end of the lever adapted to yieldingly hold thesame in its normal position engaging said fulcrums, means for operatively connecting said shaft with the driving mechanism, hand-operated means for rotating said shaft to station and lock the lever out of its normal position on either of its fnlerinns and release the same fromits locked positiolnand `means in operative connection with the driving mechanism for rotating said shaft to release said lever from its locked position.

7. In a device of theclass described. the combination of a car, driving mechanism. a cable comiectingr said car and mechanisin, a controlling shaft. a lever having two fnlcrnms, means for connecting the lever with the controlling shaft, a weight on the end of the lever adapted to yieldingly hold thi` same in its normal position engaging said fulcrmns, means for operatively 'connecting said lshaft with the driving mechanism, hand-operated means'for rotating said shaft to station and lock the lever out of its normal position on either fulernm'and release the same from its locked position, and means in operative connection with said `fable adapted to yrotate said shaftl ilo release the lever from its locked position.

8. InA a device of the'class described, the combination of a car, driving mechanism to raise and lower the car, a cable connecting said car and drivingmechal'lism, a rotary v 4.r 1 insieme,

lever with said shaft, a vvei'giitoril one end of said lever adapted to bold the saine in normalposition against botlifof seid fulcrums, means for rotating said shaft to shift,

and loclr the lever out of its normal position A and pivot it upon either of seid fnlcrnins, a

' said car and driving mechanism., a rotary shaft,- meansloperatively connecting said mechanisrnvand sliatt, an actuating lever, a

vpair of guides therefor,a fulcriiin upon each guide, means connecting said lever with said shaft, a Weight on one endet said lever adapted to hold the same in normal position against both of said fulcrnms, means for ro-` tilting said shaft to shift and lock the lever out. of its normal position andi-upon either ot' said fuleruins, ay plurality of tripping devices and a centrifugal governor, said tripping devices and governor being operatively connected `with said rotatable shaft to revolve the saine and release the lever frein-its locked position.

10. In a device of the class described, the combination of a car, driving mechanism tor raising and lowering said car, a controlling shaft, stops to limit the rotation of said shaft, means for operatively connecting said drivingr mechanism and shaft, an actuating' `lever, having two tulcrnms, arms on the shaft, a link cpnnecling one ot said arms and lever, a Weight on the lever adapted te yieldingly hold the same in engagement with said fnlcrunis, in ans Aior rotating; seid shaft to shift and lock the lever out ci, its normal position on either iinlci'um and to release the saine from its locked position, a governor rotated by eaidf driving mechanisni having two weighted arms, a spring connecting' said arios and liigs .on said arms, a bar, a ingr onone end ot' Laid bar adapted le engage said first mentioned,lugs, and lugs l on the one end oli'said bai' adaptedto envi-ige one ol said arms to rotaltx'said shaft.

ll. lin a device oi (he iclass described, the combinatiirn of a car, dri ving mechanism for raising; and lowering the car, a cable connectcilV `with said carand drivin g mechanism, a controlling shaft, stops to limiti the rotation ci .said shaft, means for operatively connecting said driving mechanism and shaft, an actuating lever having;4 two fut crnins, arms on `the shaft, a link connecting' one of said arms und lover'. a weight on the lever ada pled lo yield ii'lgly hold the saine in engagement with saidfulcrums, means tor rotating; said shaft` to Ishift and pivot the lever out of its normal position on either tulernin and to release the same from its locked position, a spring-actuated lever, a stud on one end of said lever, a pulley on said stud in rolling contact with said cable, and a lng on one end of said'leve'r for engaging one ot' said arms to rotatesaid shaft.

12. ln a vdevice of the class described, the combination of a car, a driving mechanism for raising andloivering said car, a controh ling' siiatt, stops to limit the rotation of said sliert, means for operatively connecting said mechanism and shaft, an actuating lever having guides and. tnlcrnms thereon, arms on the sliatt,'a linkconnecting one of said arms and lever, a weight on the lever adapted to yieldingly bold tbe same in engage nient with both vsaid tnlcrnms, means :tor ro toting seid shaft to station and lock thev lever ont ci its normal' position on one of the iiilcrunis, means to release the lever from its loclred position and permit it to turn on said iilcruin, a movableA beainadjacent to the path et the car, guides for said beam, puie lays on the beam, an operetingvbar, a vertically extended cable connected to one .of id arms for rotating said shaft, rollers on said bar adjacent to the opposite.A sides of seid nble, and a cable extending Afrom-one of the guides over said pulleys to said operating bar.

l3.` l'n a device of the class described, ,the

combination lof a carpa driving mechanism' for raising and lowering said car, a controle` v ling; shaft, stops Ato linut the rotation of saidv shaft', ineens for operatively connecting said mech a nis-irland shaft, an actuatin lever hai@ ingr tivo tulcruins, arms onvthe shaft, a linlr connecting one ot' said arms-and lever, e, ueigliton the lever adapted to yieldinely hold 4the seine in engagement with said fulcruins` os for roating said shaft to pivot and' l" i the lever on one ulcrum out ot its norrnal position and 4to release the saine from its locked position, a movable beam on the car, guides tor said beam, pulleys on the benin, an operating bar en the car, vertilcfillj/ extended cable cminected to one of said arms `lor ro ,ing saidshiatt, rollers on said oer adiacent to the opposite sides of the cable, and a cable extending from one of the guides over said piiilleys to said operating bar.

14. In a, device of the class described, the combination of a car, driving mechanism to raise. and lower the car, a cable. connecting seid carenti driving mechanism, a rotary controlling shaft, means operatively connecting said' mechanism and shaft, a lever having two fulcruins, meansconnecting said lever with said shaft, a Weight on one end of said lover adapted 'to liold the same in erums, means for rotating said shatt to slii'tt and lock the lever out of its normal position lio` and'pivot it upon either of said fulcrums, a plurality oft-ripping'devices and a centrifugal gm'e rnor, said tripping devices and go'V- ernor beirlg'operat-ively connected with said rotatable sha-ft to, revolve. the samefor releasing` the lever from its locked position and throwing' the driving mechanism out of gear and locking the same.

` mechanism, a rotatable controlling shaft, a

lever inoperative connection With said shaft and having a dual fiilcrum, a Weight on the lever, said lever being adapted tofnormally engage its ulcrums and pivot alternately thereon, mea-ns in operative connection with.

said shaft `for starting, stopping and throw'- ing the driving mechanism out 'of gear, a brake for said mechanism, a weighted brake leveror operating said brake and connect- .V ing means between the controlling shaft and said brake lever for raising and releasing the same to free or lock said mechanism.

16. In a device of the class described, the

' combination of driving' mechanism, a car adapted to be lifted and lowered'bysaid mechanism, a rotatable controlling shaft, a

'lever in operative connection with said shaft and having a dual fulcrum said lever being adapted to normally engage its fulcrums when the caris at rest andto pivot altermately thereon, whenthe car is respectively ascending and descending, means in operative connection with said' shaft 'for startingl.- stopping and throwing the driving mechanism out of gear, a brake on said driving mechanism,4 a .brake lever for said brake ling `shaft and said lever comprising a gear on said shaft, a second gear in mesh vWith by saidxsecond mentioned gear and a link pivotally connected at one end' to said lever and -having a slotted'pivotal connection at its other end with said arm, said means being adapted to lift said brake' lever to release the brake and drop said lever to set the bra-ke. "i

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

FRANK A. KRENZ. VVitnesSes: K. H. HANSEN, JOHN E. S'rnrnnn.

and-connecting means between' the contrplsaid first-mentioned gear, an arm operated 

